Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1983-01-13
1985-07-09
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
123415, 123643, F02P 504
Patent
active
045275220
ABSTRACT:
An ignition timing control system for an internal combustion engine (18) varies the timing of a magneto (14) in accordance with a pre-programmed ignition advance schedule. An optical pick-up (22) senses the passage of slots (26) in a disc (24) which is rotated at the speed of a distributor (16) and produces constant angular width reference pulses corresponding to fixed ignition timing in the engine's cylinders (13). A magnetic pick-up (36) detects incremental rotation of the engine's crankshaft (33) and produces timing control signals proportional to engine speed. The timing control signals and reference pulses are converted to a multi-bit data word which is used to synthesize an analog control function representing variable ignition timing using a pre-programmed digital to analog converter (58). A speed controlled switch (70) gates ignition trigger signals corresponding to the fixed timing of the reference pulses when engine speed is below a preselected value but gates ignition trigger signals corresponding to the variable ignition timing of the preprogrammed ignition advance schedule when engine speed exceeds the pre-selected value.
REFERENCES:
patent: 3853103 (1974-12-01), Wahg
patent: 4099507 (1978-07-01), Pagel
patent: 4112887 (1978-09-01), Chateau
patent: 4127092 (1978-11-01), Fresow
patent: 4128885 (1978-12-01), Valek
patent: 4164926 (1979-08-01), Kindlmann
patent: 4178893 (1979-12-01), Aoki
patent: 4300503 (1981-11-01), Deleris
Allied Corporation
Cox Ronald B.
Lamb Bruce L.
Trepp Robert M.
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